Spark plug



De 29, 1936- l. F. ECHAVE ET Al. 2,065,567

SPARK PLUG Filed Jan. 16, 1935 f@ @M im, wzuf'gnwa/ Patented Dec. 29,1936 UNITED A STATES SPARK PLUG Ignacio Florencio Echave and AlfredoGabriel Caldararo, Mar del Plata, Argentina Application January 16,1935, Serial No. 2,030 In Argentina September 25, 1934 1 Claim.

This invention relates to certain improvements in spark plugs such asused in explosive engines, consisting in the application of a movableelectrode playing on the stem or ignition rod forming an integratingpart off the assembly constituting the spark plug, which applicationdoes away with the troubles commonly met with in connection with sparkplugs of the type at present in use, consisting in the frequentnecessity of subjecting the spark plugs to careful cleansing in order toextract the particles of carbon settling upon the inner wall of theirbodies.

With this end in view, as well as others to be detailed further on, theinvention is disclosed, for the purpose of illustration, in the annexeddrawing, in which:-

Figure 1 is a view of the assembly of a common type spark plug, thelower part of its body 2O being cut open in order to show the way ofapplication of the movable electrode.

Figure 2 represents, in perspective view, the electrode, showing thestructural shape thereof.

In these views, the same reference numbers 25 indicate the same orcorresponding parts.

The assembly which forms the subject-matter of the present invention,comprises the following partsz-one electrode l, of adequate section,provided centrally with a longitudinal bore 2,

30 passing from one end to end, through which bore the stem or ignitionrod 3 is inserted. This rod, at the lower part of the spark plugassembly, is of smaller diameter than the one of the bore 2, therebypermitting the free play of 35 the electrode in vertical displacementdownwardly, a displacement which is limited between the stop 4 formed atthe lower extremity of the rod 3, and the lower end of the insulatingcone 5 forming an integrating part of common type 40 spark plugs.

The operation is the followings- As clearly shown in Figure l, betweenthe electrode l and the stem or ignition rod 3 a small gap or space isprovided, causing an interruption spark to be 45 formed between bothparts, when electrode l is in raised position, before a spark occurs inthe main gap between the electrode and lower skirt 6 of the spark plugbody, thus permitting of greater power and economy in fuel.

50 At the moment of the explosion occurring, the

(Cl. 12S- 169) electrode I is thrown upwardly which causes the automaticcleansing of any particle of carbon which might have become settledbetween the electrode I and the internal part of the lower skirt 6.

By the details disclosed herein and in the annexed drawing, theadvantages obtained through the distinctive feature of applying in sparkplugs the movable electrode, are clearly set forth in their functionalorder, namely: 10 increase in power of the engine and consequent savingof fuel, also considering the advantages set forth hereinbefore withregard to the automatic cleansing of the spark plug during itsoperation, obviating the necessity of frequent 15 changes due to damagescaused to the spark plugs on account of excessive wear.

It is clearly understood that the improvements serving as a basis to theprinciple which is the subject-matter of the present invention, may beapplied to anyone of the different types of spark plugs up to thepresent known and in use.

Having thus clearly described the present invention and the manner ofcarrying same into practice, what is claimed to be the exclusive rightand property of the inventors, is:-

In a spark plug, a body provided with a depending skirt constituting anelectrode and having a cylindrical bore extending from its lower end, aninsulating member secured in said body and extending into said bore fromthe upper end thereof, a conducting rod electrode extending through saidmember and downward into said bore concentrically therewith with itslower end remote from the lower end of said insulating member, and acylindricalelectrode member loosely mounted about said rod in spacedrelation thereto and freely movable lengthwise thereof, said electrodemember having a central bore therethrough of materially greater diameterthan and accommodating said rod, the lower portion of said memberdefining with the surrounding Wall of said skirt a restricted annularpassage of uniform width, said rod having an abutment at itsI lower endlimiting downward movement of said electrode member and the length ofthe latter being materially less than the length of said rod below saidinsulating member.

IGNACIO- FLORENCIO ECHAVE.

ALFREDO GABRIEL CALDARARO.

